

\documentclass[tikz,border=2pt]{standalone}
\begin{document}

\begin{tikzpicture}



\draw[help lines] ( -5,-5 ) grid ( 5, 5);
\draw[red] (-3,0) -- (3,0);
\draw[red] (0,-3) -- (0,3);

\draw (0,0) circle (1); 

\end{tikzpicture}


\end{document}
